Permutation and Combination - Arrangements with Repetition Allowed
Permutation and Combination - Arrangements with Repetition Allowed
A four-letter word can be formed from any of the \(26\) letters in the alphabet. Determine the number of such words with
- repetitions of the letters allowed,
- different letters and containing exactly one vowel,
- repetitions allowed and containing at least one vowel.
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Answer:(i) \(456\,976\) (ii) \(159\,600\) (iii) \(262\,495\)
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